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Commit 3d77b30e authored by Soren Brinkmann's avatar Soren Brinkmann Committed by Daniel Lezcano
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clocksource: cadence_ttc: Reuse clocksource as sched_clock 



Reuse the TTC clocksource timer as sched clock provider.

Signed-off-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: default avatarMichal Simek <monstr@monstr.eu>
parent 9bbf9140

drivers/clocksource/cadence_ttc_timer.c

+12 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/slab.h>

#include <linux/sched_clock.h>



/*

 * This driver configures the 2 16-bit count-up timers as follows:
@@ -94,6 +95,8 @@ struct ttc_timer_clockevent { 
#define to_ttc_timer_clkevent(x) \

		container_of(x, struct ttc_timer_clockevent, ce)



static void __iomem *ttc_sched_clock_val_reg;



/**

 * ttc_set_interval - Set the timer interval value

 *
@@ -155,6 +158,11 @@ static cycle_t __ttc_clocksource_read(struct clocksource *cs) 
				TTC_COUNT_VAL_OFFSET);

}



static u32 notrace ttc_sched_clock_read(void)

{

	return __raw_readl(ttc_sched_clock_val_reg);

}



/**

 * ttc_set_next_event - Sets the time interval for next event

 *
@@ -296,6 +304,10 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base) 
		kfree(ttccs);

		return;

	}



	ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;

	setup_sched_clock(ttc_sched_clock_read, 16,

			clk_get_rate(ttccs->ttc.clk) / PRESCALE);

}



static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,